Here, the frequency of the test signal is kept constant while the amplitude is varied. The main application for the stepped sweep is to measure the linearity of systems.
Since the settling time of different test objects cannot be predicted, the duration of a stepped sweep cannot be determined exactly in advance.įor the determination of amplitude or frequency response, the stepped sweep has been largely replaced by the glide sweep. The stability condition (settling) can be defined by the user. The scaling of the steps is linear or logarithmic. After each change, the analyzer waits until a stable reading is detected before switching to the next step. In a stepped sweep, one variable input parameter (frequency or amplitude) is incremented or decremented in discrete steps. The reason for this lies with the high computing power required. Smartphones, tablets or smart devices.Īlthough the theory behind the glide sweep has been known for several decades, its use in audio measuring devices has only evolved over the past several years.
This method is particularly useful when measuring devices which do not have an audio input channel, e.g. To indicate to the measurement system that the test signal is about to start, the sweep signal is preceded by a short trigger sequence. The Level 4 product features 1/12th and 1/24th octave RTAs while adding a white noise source to all the features mentioned above.Since the exact duration of the sweep signal is known, the glide sweep is ideally suited for measuring signals that are not played by the audio test system itself, rather by the device under test. Level 3 provides a 1/6th octave RTA and further adds crest factor metering and a powerful digitally generated sweep for very precise frequency response measurements. TrueRTA Level 2 ups the RTA resolution to 1/3rd octave and adds dBu metering.
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Everyone is encouraged to download the basic free version. The free Level 1 provides a one-octave real time analyzer with fully adjustable frequency and dB limits and also includes a sine wave generator, pink noise source, true rms voltmeter and oscilloscope. Pricing for higher levels is quite modest and is based on the RTA resolution although the higher levels also add further features.
TrueRTA operates at four performance levels. The Level 1 version is free and can be downloaded at No special hardware is required. TrueRTA also includes a Signal Generator, Oscilloscope and several Digital Metering functions making it a complete audio test set capable of replacing a number of traditional test instruments.
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Now, with the release of TrueRTA, everyone with a PC and an interest in audio can explore the sonic world around them and see firsthand the spectral nuances of their favorite music. While spectrum analyzers have become a standard component of every audio engineer's toolbox, traditional bench-top or hand-held real time analyzers continue to cost a small fortune. It is becoming more common to see RTAs in use by musicians, do-it-yourself speaker builders and home audio enthusiasts. Hiding behind TrueRTA's friendly face is an army of powerful digital signal processing (DSP) routines that transform your desktop or notebook PC into an easy to use Real Time Analyzer (RTA).
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True Audio has announced the release of TrueRTA - the first of their new line of audio measurement software for PCs running Windows.
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